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Remove environment variable
Since R2022b
unsetenv(varname)
unsetenv(varname) removes the operating system environment variable varname. If any elements in varname do not exist, then unsetenv has no effect.
varname
unsetenv
example
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Create environment variable myVar, and then check that it exists.
myVar
setenv("myVar","myValue"); isenv("myVar")
ans = logical 1
Remove myVar, and then check that it no longer exists.
unsetenv("myVar"); isenv("myVar")
ans = logical 0
Create multiple environment variables, and then check that they exist.
setenv(["Var1" "Var2" "Var3" "Var4"],["Val1" "Val2" "Val3" "Val4"]); isenv(["Var1" "Var2"; "Var3" "Var4"])
ans = 2×2 logical array 1 1 1 1
Remove two of the environment variables using unsetenv, and then check that they no longer exist.
unsetenv(["Var1" "Var4"]); isenv(["Var1" "Var2"; "Var3" "Var4"])
ans = 2×2 logical array 0 1 1 0
You can also remove environment variables using setenv with missing. Change the value of one environment variable and remove another.
setenv
missing
setenv(["Var2" "Var3"],["ValB" missing]); isenv(["Var1" "Var2"; "Var3" "Var4"])
ans = 2×2 logical array 0 1 0 0
Environment variable names, specified as a string scalar, character vector, string array, or cell array of character vectors.
Example: "PATH"
"PATH"
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Usage notes and limitations:
Code generation does not support the use of unsetenv inside parfor loops.
parfor
Remove multiple environment variables by using unsetenv with a string array or cell array of character vectors as input.
getenv | isenv | setenv | loadenv | system | unix | dos
getenv
isenv
loadenv
system
unix
dos
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